Working face mine pressure on-line monitoring system based on fiber grating sensing

Abstract

The invention belongs to mine pressure on-line monitoring systems, and discloses a working face mine pressure on-line monitoring system based on fiber grating sensing. According to the monitoring system, a plurality of measurement points are selected on a working face in a pit, one monitoring system is installed inside each measurement point, a hydraulic control valve of each monitoring system is installed in a hydraulic support and is connected with a pressure guide hole of an intrinsic safety type fiber grating pressure meter through an oil pipe, an optical signal of the intrinsic safety type fiber grating pressure meter is transmitted to a fiber grating demodulator on the ground through an optical fiber and a mining optical cable, the fiber grating demodulator is demodulated into a digital signal to be transmitted to a computer system, and the computer system carries out real-time monitoring and analysis processing. The working face mine pressure on-line monitoring system based on the fiber grating sensing has the advantages of being simple in installation, adopting full-optical measurement and optical fiber transmission, being capable of effectively avoiding influence of electromagnetic interference, greatly improving monitoring accuracy due to adoption of a temperature compensation grating for compensating a temperature error, and being capable of timely providing a working face mine pressure monitoring and predicting result so as to bring convenience to production and scientific researches of a guidance site.

Description

technical field [0001] The invention relates to an on-line mine pressure monitoring system, in particular to an on-line mine pressure monitoring system on a working face based on optical fiber grating sensing, which is applied to the field of pressure monitoring of hydraulic supports on coal mine fully mechanized mining face. Background technique [0002] In recent years, with the continuous improvement of mining technology and the continuous increase of mining depth, the disasters caused by the emergence of mine pressure have become more and more serious, such as roof caving, roadway deformation, and impact mine pressure. The industry has caused huge losses, seriously affecting the safety of employees and mine production. Therefore, as one of the important means of guaranteeing mine safety production, mine pressure monitoring has been paid more and more attention, and the requirements for the accuracy, reliability and online monitoring ability of monitoring are also getting...

AI Technical Summary

Problems solved by technology

[0003] Although some progress has been made in the field of artificial intelligence monitoring at home and abroad, such as the use of single-chip microcomputer-controlled vibrating wire pressure sensors for monitoring, such existing mine pressure monitoring methods generally have the following disadvantages: 1. Susceptible to electromagnetic interference and The external environment interferes and the monitoring accuracy is not good; 2. It is not moisture-proof, the reliability is low, and the service life is short, which cannot meet the requirements of long-term monitoring; 3. A large number of points for a single device leads to high cost and low reuse rate of the entire monitoring system

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